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