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"These differences in the contral layer DOS, which should approximate the bulk DOS if the slab were thick enough, are largelyy size effects due to the finite thickness of the slabs."
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"From the comparison of Figs.1a and 1b we can state that there is some decrease (of the order of 0.5eV) of the band gap width wich the increase of the slab thickness. The size effects and the surface effects manifest themselves better in the layer density-of-states plots."
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