We find evidence of intermolecular interactions for a self-assembled monolayer (SAM) formed from a large molecular adsorbate, [1,1';4',1"-terphenyl]-4,4"-dimethanethiol, from the dispersion of the molecular orbitals with changing the wave vector k. Both unoccupied and occupied molecular orbitals hybridize to electronic bands, with significant band dispersion. that appears to be dependent on structure. The results demonstrate that Bloch's theorem can apply to the wave vector dependence of the electronic band structure for monomolecular films formed from a relatively large polyphenyl-based species.