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