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Figure 5
Halide ion displacements within a single BX42− layer with a ψ-tilt (left), ϕ-tilt (center) or θ-tilt (right), as viewed parallel (top) and perpendicular (bottom) to the layer. The + and − symbols indicate the movement of the bridging halide ions above and below the plane of the projection, respectively. The blue and pink shading shown in the lower left diagram highlights the chemical inequivalence of the A-sites resulting from ψ-tilts.

IUCrJ
Volume 10| Part 4| July 2023| Pages 385-396
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523003743