{TAIL ~ A first conductive layer} is formed in {HEAD ~ the ring} shaped trench of the first dielectric layer 
{ TAIL ~ A first conductive layer } is formed in { HEAD ~ the ring } shaped trench of the first dielectric layer
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH