  The Huckel molecular-orbital method (with overlap S) is used to derive the
S-modified version of the renormalization equations, which are then employed to
introduce overlap into the para-, meta- and ortho-benzene dimers' parameters.
Invoking the Lippmann-Schwinger scattering theory enables the spectral energy
transmission function T(E) to be found for each of the benzene types. The
effect of overlap on the behaviour of the various T(E) curves is, indeed,
marked, even for low values of S, where all the curves' symmetries become
permanently broken. As S increases, the graphs become more distorted and suffer
displacements to lower energies. These results are so significant that they
justify the inclusion of overlap in all T(E) studies of benzene.
