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Figure 4
The two kinds (A and d/b) of layers in GalC8 separated by dotted lines. Atoms as given in Fig. 2[link]. The (idealized) symmetry elements (21 screw rotations) of the A layers are indicated using the standard symbols. Brackets to the right indicate layer n-tuples: individual layers, MERs and fragments of the MDO polytypes.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 82| Part 3| June 2026| Pages 352-359
https://doi.org/10.1107/S2052520626004907
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