]FIG. 20A is a side view of another embodiment of an interposer, according to the present invention. [0157]FIG. 20B is a side view of the interposer of FIG. 20A disposed between two electronic components, according to the present invention. [0158]FIG. 21 is a perspective view of another embodiment of an interposer, suitable for making engineering changes, according to the present invention. [0159]