The planes of chips in a flip-chip arrangement, when at least one of the
chips has an insulating layer running through it, may be electrically
connected together by incorporating into the top chip a flexible
metalized structure which is pinned to the top layer of the bottom chip
using a wire bond ball which is connected to a wire that is attached to a
pad on the top layer of the upper chip. A single connection connects both
layers of the top chip to the layer on the bottom chip. The flexible
structure may be similar to a collapsible cup with a hole in the middle
or it may be a tiltable micro mirror.