The electro-optical behaviour of a platinum or gold electrode covered
with thin polyaniline (PANI) films has been studied using electrorefle
ctance (ER) and differential reflectance (DR) techniques. Depending on
the electrosynthesis procedure a drastic polarization selectivity in
the red part of the optical spectra has been observed. This effect was
shown to reflect a great extent of the orientation of PANI chains per
pendicular to the electrode surface.