assembly process with BURIED brands

The invention relates to an assembly method of forming at least two substrates with at least one alignment mark, comprising the steps of: a) at least one mark forming step (10) of alignment or in a first substrate (4) or a layer formed thereon, b) a first step of assembling the first substrate, or a layer formed on said first substrate with a second substrate (2) or a layer formed on the second substrate, c) a step of thinning at least a peripheral portion of at least one of the two substrates, to show at least one of said alignment marks.