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Figure 6
Comparison of the (a) X3+(0, a) and (b) X4+(0, a) modes, derived from the RP parent. Two layers are plotted, separated by half a unit cell. Notice that the top (yellow) layer tilt pattern is identical for each, but in the bottom (blue) layer tilts change in relative sense. The corresponding Glazer-like notation is a−a−c0/−(a−a−)c0 and a−a−c0/a−a−c0, respectively.

IUCrJ
Volume 8| Part 4| July 2021| Pages 485-513
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521005418