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Fragments of the inorganic lattices in (A) (MA)PbBr3 and (B) (MA)PbI3 in their ambient-pressure α (left) and high-pressure β phases (right). Areas of structural distortion upon compression are the Pb–X–Pb angle (X = Br or I) resulting from octahedral rotation about the [001] direction (θAB), the Pb–X–Pb angle resulting from octahedral rotation about the [100], [010], and [001] directions (θR), and the Pb–X bond length (d).
