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Figure 1
Illustrations of selected cut planes with geometric cut symbols xd, pd, md, hd and kd. The (x, y, 0) plane of a unit cell is outlined with thin lines. The unit-cell origin is labelled with 0, the basis vectors with a and b. The traces of cut planes are indicated with thick lines; small attached triangles indicate the `inside' direction. (a) Geometric interpretation of equations (7)[link] and (8)[link] using the xd flock as an example. (b) Cut planes in the pd and md flocks as they appear in a tetragonal system. The p2 and [\sim]p2 cut planes illustrate the geometric interpretation of equation (6)[link]. (c) Cut planes in the pd, md, hd and kd flocks as they appear in a trigonal or hexagonal system.

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ISSN: 2053-2733
Volume 67| Part 3| May 2011| Pages 269-275
https://doi.org/10.1107/S0108767311007008
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