A method for aligning multiple substrates. The method includes providing a
handle substrate, providing a spacer substrate, and forming a plurality
of first alignment marks on a first surface of the handle substrate. The
method also includes forming a plurality of self-limiting alignment marks
on a first surface of the spacer substrate and forming a plurality of
openings in the spacer substrate, each of the plurality of openings
surrounded by standoff regions. The method further includes aligning the
first surface of the handle substrate and the first surface of the spacer
substrate using the first alignment marks and the self-limiting alignment
marks and bonding the handle substrate to the spacer substrate to form a
composite substrate structure. In a specific embodiment, the plurality of
self-limiting alignment marks and the plurality of openings are formed
using an anisotropic wet etching process that preferentially etches the
spacer substrate.