{TAIL ~ The surface area} of contact between the first and the second layers can define a frame about {HEAD ~ the perimeter} of the reservoir 
{ TAIL ~ The surface area } of contact between the first and the second layers can define a frame about { HEAD ~ the perimeter } of the reservoir
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH