Similarly , inner mantle layer 2106 may compress to have a fourth thickness T4 associated with the second piezoelectric material in the presence of an applied electric current .
In this embodiment , third thickness T3 is smaller than first thickness T1 .
Inner mantle layer 2106 may compress to have a fourth thickness T4 associated with the second piezoelectric material in the presence of an applied electric current .
In this embodiment , third thickness T3 is smaller than first thickness T1 .