A unified setting of the unit vectors in superspace groups for composite crystals is discussed. It simplifies the description of composite crystals and gives a systematic method for analyzing composite crystals in a manner similar to modulated structure analysis. The setting is generally different from the standard setting for modulated structures. The reflection conditions specific to it are given. The equivalence relation of the superspace groups for composite crystals is introduced. This is different from that for modulated substructures and leads to new symbols for the super-space groups of composite crystals.
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Atsushi Yamamoto (1992) studied this question.