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(a, b) Single crystals and crystal structures for 3D Cs2AgBiBr6 (n = ∞) halide perovskites and layered PeABr2 (n = 2) and PeABr1 (n = 1) compounds, respectively, as refined from XRD measurements; (c) XRD patterns for PeABr2 (n = 2) and PeABr1 (n = 1) compounds.
