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Reliability
Triple Layer Structure
·When Eb=Es (a special case of increasing substrate
thickness),
t
t
R
r t
f
f
s
b
z =
+ +
n
2
4
2E t
s s
·The insertion of a buffer layer with Eb can change the
position of the neutral layer.
·Furthermore, if tf << ts, the zn moves toward the film by
tb/4.

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