We prove, by realistic microscopic calculations within the sp³s* tight-binding method for GaAs(110) and GaAs(100), that the surface optical properties are not influenced by long-range crystal termination effects, and hence that they can be consistently studied considering slabs of limited thickness (20--30). The origin of derivativelike and bulklike line shapes in reflection anisotropy spectra is also discussed, analyzing the effects arising from possible surface-induced reduction, broadening, and shifting of the bulk spectrum near the surface.
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Sole et al. (1999) studied this question.
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