Category: atom_site_rot_Fourier_param
Data type: char
Must appear in a looped list
Must match a value of '_atom_site_rot_Fourier_id'
A code identifying the (in general complex) coefficient of each term present in the Fourier series describing the rotational part of the displacive modulation of a given rigid group. This code must match _atom_site_rot_Fourier_id.