Resonant Brillouin scattering spectra are measured on a layer semiconductor 2H–PbI 2 . The observed exciton polariton dispersion in the direction parallel to the c -axis is interpreted by a two branch polariton model yielding the translational exciton mass of 2.3 m 0 and the effective dielectric constant of 10. The anisotropy of the effective mass is estimated to be m // / m ⊥ =3.4 for exciton and 4.4 for conduction electron, respectively.
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Takenari Goto (1982) studied this question.
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