Biocompatible multi-layered structure comprising foam layers and a functional interface

A biocompatible multi-layered structure comprising a first foam layer showing a first degree of porosity and a second foam layer showing a second degree of porosity, both foam layers being attached to one another through an interface, wherein said interface is obtained from at least one of said foam layers and has a degree of porosity which is less than the degree of porosity of any of said foam layers.