Additional Boundary Conditions: Critical Comparison between Theory and Experiment

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Abstract
A linear-response theory leads to a generalized additional boundary condition (ABC) which includes as special cases all the well-known ABC's. Calculations for the reflectivity are compared with an experimental spectrum of CdS. Strong evidence is found in favor of the Pekar ABC and against other ABC's. Comparison with an attenuated total reflectivity spectrum of ZnO suggests that a more sophisticated surface response is necessary for semiconductors with a small exciton-free surface layer.