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Figure 2
For any a > b > 0, let the lattices [\Lambda,\Lambda^{\prime}\subset\mathbb{R}^{2}] have the unit cells [U,U^{\prime}] of the rectangular forms a × b, b × a, respectively. Any collection of [m\geq 2] points with fractional coordinates [x\neq y] in [0, 1] defines different motifs [M\subset U] and [M^{\prime}\subset U^{\prime}]. Then the periodic point sets [S = \Lambda+M], [S^{\prime} = \Lambda^{\prime}+M^{\prime}] can be arbitrarily different, though their CIFs differ only by swapping the lengths a, b of the basis vectors.

IUCrJ
Volume 11| Part 4| July 2024| Pages 453-463
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524004056