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