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Development of Valence Bands of C60 from Submonolayer to Two and Three Dimensionality

For submonolayer amounts of C60 condensed on Sn substrate, the peaks derived from top two occupied molecular orbitals were broadened by 0.3 eV in comparison with solid C60. For coverage θ < 1 monolayer, the broadenings are independent of the coverage. It indicates that the delocalizations of electrons in valence bands of C60 are weak and the widths do not reflect the true band dispersions.