In (PEA)2PbI4 the low-energy excitonic multiplet is intralayer fine structure from crystal symmetry and octahedral distortions, while a ~45 meV higher doublet matches calculated interlayer excitons made visible by distortion-induced mixing.
Electronic and Excitonic Structures of Inorganic--Organic Perovskite-Type Quantum-Well Crystal (C _4 H _9 NH _3 ) _2 PbBr _4 , url =
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Intra- and Interlayer Excitonic Fine Structure of the Two-Dimensional Perovskite (PEA)$_2$PbI$_4$
In (PEA)2PbI4 the low-energy excitonic multiplet is intralayer fine structure from crystal symmetry and octahedral distortions, while a ~45 meV higher doublet matches calculated interlayer excitons made visible by distortion-induced mixing.