a third semiconductor layer formed on {HEAD ~ the second semiconductor layer} in {TAIL ~ exactly the same size} and pattern as the latter 
a third semiconductor layer formed on { HEAD ~ the second semiconductor layer } in { TAIL ~ exactly the same size } and pattern as the latter
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH