In the preferred embodiment, {HEAD ~ the layers} 116 are composed of {TAIL ~ polypropylene} having a thickness of approximately 20.0 microns, with a thickness variation of 0.3 microns 
are composed of
In the preferred embodiment , { HEAD ~ the layers } 116 are composed of { TAIL ~ polypropylene } having a thickness of approximately 20.0 microns , with a thickness variation of 0.3 microns
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH