multilayer structure with metal deposition prong

The invention relates to a multilayer structure (1) comprising at least a first layer (10) comprising a first polymer film (13) on a first face (15) a metallic deposit (50), said first face (15) being a free face of the first layer (10) and at least one second layer (20) comprising a second polymer film (23). The second layer (20) is attached in several connecting regions at the first layer (10) on the first face (15) carrying the metal deposit (50), these connecting areas defining a contact region (30) between the first layer (10) and the second layer (20), the first layer (10) and the second layer (20) outside said contact region (30) forming at least one cell (42).