The invention relates to flat film conductors comprising thermoplastic polyurethane and stabilised thermoplastic polyurethane comprising antioxidants and metal deactivators, preferably for use in flat film conductors. A particular advantage of exonuclease-mediated reassembly methods is the ability to reassemble nucleic acid strands that would otherwise be problematic to chimerize. A thermally sprayed film having a thickness equivalent to a height difference between the protruding portion and the outer peripheral surface is deposited on the outer peripheral surface such that the thermally sprayed film becomes continuous with the protruding portion.