Modelling Phase Organic Conductors

~-phase organic conductors with bidimensional layers of orthogonal molecular dimers are modelled by tetramers and hexamers of appropriate geometry. The complex conductivity is calculated within the Hubbard model including the electron-intramolecular vibration coupling. The polarized optical conductivity data of two ~-phase charge-transfer salts of b~s-(ethylenedithio)-tetrathiafulvalene: ~-(BEDT-TTF)2(Hg(SCN)2Br] and ~-(BEDT-TTF)2 [Hg(SCN)C12), are, discussed.