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