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Introduction

This report is concerned exclusively with the nomenclature of polytype structures. An earlier recommendation on polytype nomenclature was published in Acta Cryst . (1977), A33, 681-684 by a joint IUCr-IMA committee. In part III of that recommendation, a new symbolism that was based on the work of Dornberger-Schiff & Durovic (1974) and Zvyagin (1967, 1974) was proposed but not given in detail. The present report gives a full description of these symbols in §II.2 as approved by the Ad-Hoc Committee. For completeness, the basic 1977 recommendations are included in §§I and II.1 in modified form.

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