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