FIG. 2. Color online K QW band, surface states and resonances, and Cu bulk bands for a Cu 111 , b 0.4 ML K /Cu 111 , and c 1 ML K /Cu 111 . The photon energy is 80 eV. All surface and bulk bands exhibit coverage-dependent shifts, suggesting that K adsorption affects the crystal potential not only at the surface but also inside the substrate.
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