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