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(a) Angle between the Sb to lone pair vector and the Sb to Sb vector as a function of pressure. The angle is indicated as α′ in Fig. 4 ▸(b) for the equilibrium volume. (b) and (c) ELF in the (001) plane at z = 1/2 for the structure with a volume reduction of (b) 6% and (c) 10%. Contours are drawn from 0 (blue) to 1 (red); (b) and (c) are compared with Fig. 4 ▸(a) at equilibrium volume.
