  Distortions in a family of conjugated polymers are studied within two
complementary approaches, i.e. within a many-body Valence Bond (VB) approach
using a transfer matrix technique to treat the Heisenberg model of the systems,
and also in terms of the tight-binding band-theoretic model with interactions
limited to nearest neighbors. The computations indicate that both methods
predict the presence or absence of the same distortions in most of the polymers
studied.
