The above expression obtained for 〈|𝑀 𝑖𝑗 | 2 〉 (Eq. 12) is somewhat similar to the one formulated in Ref. in the study of charge transport along polymer chains. In the above-mentioned work, the average of squared fluctuation of the inter-monomer coupling (𝐺 2 ) has been taken as a constant; however, in the present study the coupling element depends on the dihedral orientation of the monomers in the frozen configuration.