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Figure 9
(a) The molecular layer at x = [ 1\over 8] in model 1 viewed down a showing the major (M, dark blue) and minor (m, light blue) positions related by −0.158b. (b) The two adjacent layers, at x = [ 1\over 8] (blue molecules, M1–M4) and x = [ 3\over 8] (green molecules, M1′– M4′) in model 1 viewed down a. Only the major components and the symmetry relationships between them are shown. In this figure only the first layer (x = [ 1\over 8]) 21 axes are shown. Black circles represent inversion centres at x = 0 and ½ while grey circles are inversion centres at x = [ 1\over 4] and [ 3\over 4]. The g-glide planes at x, [ 1\over 4], z and x, [ 3\over 4], z are also shown.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 70| Part 2| March 2014| Pages 283-295
doi:10.1107/S2052520614000407
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