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Figure 8
Extended version of the sketch shown in Fig. 7[link]. An incommensurate case with a q vector of 0.238·a1* is assumed (a). The closest simple rational number here is 0.25 = ¼, which results in a fourfold superstructure (b). Note the skew of the lattice compared with the original geometry (dashed lines). The resulting (different!) atomic positions from the incommensurate representation (black circles) and the superstructure (green circles) are depicted at the bottom (c).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 65| Part 3| May 2009| Pages 249-268
doi:10.1107/S0108768109015614
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