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 0.3eV 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.