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