Abstract: The present invention relates to a polyamide-based multilayer structure comprising in succession: an upper layer made of a transparent polyamide coming from the condensation: either of a lactam or of an ?,?-amino acid having at least 9 carbon atoms or of a diamine and of a diacid, at least one having at least 9 carbon atoms; a lower layer capable of adhering to the substrate and optionally, an intermediate tie layer (also called a central layer) between the upper layer and the lower layer, each of the layers exhibiting thermomechanical behaviour (strength as a function of temperature) sufficiently similar to allow the structure to be easily formed under the effect of the temperature. The invention also relates to the objects consisting of these substrates covered with these structures, the lower layer being placed against the substrate.