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Acta Cryst. (1984). A40, 399-404

Nomenclature of Polytype Structures

Report of the International Union of Crystallography Ad-Hoc Committee on the Nomenclature of Disordered, Modulated and Polytype Structures*

By A. GUINIER (Chairman), Université de Paris-Sud, Centre d'Orsay, Laboratoire de Physique des Solides, Bâtiment 510, 91405 Orsay, France

G. B. BOKIJ, Institute of Geology, Mineralogy and Petrography, Academy of Sciences of the USSR, Staromonetny 35, Moscow 109017, USSR

K. BOLL-DORNBERGER, $\dagger$ Akademie der Wissenschaften der DDR, Zentralinstitut für physikalische Chemie, Rudower Chausee 5, DDR-1199 Berlin, German Democratic Republic

J. M. COWLEY, Department of Physics, Arizona State University, Tempe, AZ 85287, USA

S. DUROVIC, Laboratory for Structure Research, Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta, 84236 Bratislava, Czechoslovakia

H JAGODZINSKI, Institut für Kristallographie und Mineralogie, Universität, Theresienstrasse 41, D-8000 München 2, Federal Republic of Germany

P. KRISHNA, Department of Physics, Banaras Hindu University, Varanasi-221005, India

P. M. DE WOLFF, Department of Technical Physics, Delft University of Technology, Lorentzweg 1, 2628 Delft, The Netherlands

B. B. ZVYAGIN, Institute of Geology, Mineralogy and Petrography, Academy of Sciences of the USSR, Staromonetny 35, Moscow 109017, USSR

D. E. COX, (ex officio , IUCr Commission on Neutron Diffraction), Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA

P. GOODMAN, (ex officio , IUCr Commission on Electron Diffraction), CSIRO Division of Chemical Physics, PO Box 160, Clayton, Victoria 3168, Australia

TH. HAHN, (ex officio , IUCr Commission on International Tables), Institut für Kristallographie, RWTH, Templergraben 55, D-5100 Aachen, Federal Republic of Germany

K. KUCHITSU, (ex officio , IUCr Commission on Electron Diffraction), Department of Chemistry, Faculty of Science, University of Tokyo, 3-1 Hongo 7-chome, Bunkyo-ku, Tokyo 113, Japan

and S. C. ABRAHAMS (ex officio , IUCr Commission on Crystallographic Nomenclature), AT&T, Bell Laboratories, Murray Hill, NJ 07974, USA

(Received 28 September 1983; accepted 25 January 1984)

* Appointed in 1979 by the IUCr Executive Committee under ground rules outlined in Acta Cryst . (1979). A35, 1072. Final Report accepted in 1983 by the IUCr Commission on Crystallographic Nomenclature and the Executive Committee.

$\dagger$ The major contributions made by K. Boll-Dornberger to this Report until her death in July 1981 are deeply appreciated.

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