A layered nanocomposite with poly(diallyldimethylammonium), PDDA, intercalated between manganese oxide layers can be formed on a platinum electrode in a thin film form through a direct electrochemical route. The process involves a potentiostatic oxidation of aqueous Mn2+ precursors in the presence of PDDA by applying a constant potential (+1.0 V vs Ag/AgCl).