disposing the body within the cavity such that {HEAD ~ the inner layer} contacts {TAIL ~ the body} in a first position 
disposing the body within the cavity such that { HEAD ~ the inner layer } contacts { TAIL ~ the body } in a first position
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH