For example, a first one of {HEAD ~ the conducting layers} may be comprised of {TAIL ~ a first material} and a second material 
comprised of
For example , a first one of { HEAD ~ the conducting layers } may be comprised of { TAIL ~ a first material } and a second material
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH