In one embodiment, {HEAD ~ an inner layer} of {TAIL ~ the multi layer substrate} can be provided with perforations 
of
In one embodiment , { HEAD ~ an inner layer } of { TAIL ~ the multi layer substrate } can be provided with perforations
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH