FIG. 3. Color online a Band bottom position of the K QW and intensity variation of the K ML resonance near metallic condensation dotted line in Fig. 1 vs coverage. b Normalized photoemission intensity for the Cu surface state, the 0.5 ML K covered surface state, and the K ML resonance as a function of k . A strong variation is observed for the K ML resonance, as expected from the wave function properties see the text .
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