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ABSTRACT:The electronic properties of surfaces covered by adsorbates are often investigated by means of the semiempirical LCAO method. This implicitly requires the existence of parameters that correctly account for the bulk as well as for the surface electronic structure of the substrate. We will show that, in general, such parameters cannot be found by fitting just the available experimental data for the bulk band structure: some results for the surface states must also be taken into account. We have found that very few data, for just one surface, are sufficient to select a set of parameters that give electronic bands in good agreement with experiment for the bulk as well as for the three low-order surfaces that we have investigated.

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