The invention relates to a method of manufacturing a replica, which method comprises the provision of a polymerizable resin composition between a front mold having a pre-shaped surface and a back mold having a pre-shaped surface, carrying out a curing treatment and removing the replica thus manufactured from the molds. An indication of an initiation of a call by a first user to a second user is received. A layer of tin is formed on the copper heat spreader. The transistor also includes a control gate placed between the source region and the drain region, and separated from the substrate by a thin control dielectric.