We describe the appearance of a new, relaxation-induced, transverse-optical surface mode above the bulk continuum in RbBr and RbI. Because of its polarization perpendicular to the surface the mode should be amenable to experimental verification by inelastic He scattering. The discussion includes other perpendicular surface modes such as the ``optical'' and the ``acoustical'' Rayleigh modes.
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Wette et al. (1987) studied this question.
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