Raman polarizability tensors for layered crystals, CdI₂, GaSe, and red HgI₂ are calculated on the basis of the bond-polarizability concept. It is shown that out-of-plane folded modes are missing or very weak. Missing modes arise from the cancellation of the bond Raman polarizabilities within a unit cell. From a comparison with observed Raman spectra the nature of the atomic bonding is discussed.
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Nakashima et al. (1986) studied this question.
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