{HEAD ~ a layer} of {TAIL ~ a second conductive metallization} on either side of the pair of layers of the electrodisplacive material 
{ HEAD ~ a layer } of { TAIL ~ a second conductive metallization } on either side of the pair of layers of the electrodisplacive material
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH