By unbounded is meant that the adhesive clusters do not include any applied linear boundary or {TAIL ~ perimeter} of adhesive defining {HEAD ~ the cluster area} 
By unbounded is meant that the adhesive clusters do not include any applied linear boundary or { TAIL ~ perimeter } of adhesive defining { HEAD ~ the cluster area }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD