Optical reflectance and transmittance measurements between 0.3 and 5.5 eV were performed on (SN) x -films which showed a parallel orientation of the crystallites with respect to their polymer chain axis. The optical behaviour below 3 eV for light polarized parallel to the chain axis and in particular a strong absorption peak between 1 and 2 eV is explained to be a Maxwell-Garnett resonance of the free carriers. The influence of the free carriers is also observed for light polarized perpendicular to the chains and is analysed by the same model. From the anisotropy of the transport properties the interchain coupling is inferred.