While numerous processes may lead to capacitive currents that contribute to the charge accumulated as the PEDOT thin film grows (Supplementary Section S6), capacitive currents due to an anion-exchange process as oligomers adsorb at the L|L interface and reversible proton adsorption/desorption to the growing or fully grown PEDOT thin film are the most relevant for PEDOT interfacial electrosynthesis. A point to note is that pseudocapacitance cannot be recorded at the polarisable aqueous|TFT interface as, in a major contrast with PEDOT thin films on solid electrode surfaces, doping/dedoping processes are not taking place during CV cycling at the polarisable L|L interface.