wherein the intermediate layer is in the form of {HEAD ~ a continuous layer} comprising at least one recess, {TAIL ~ the at least one recess} forming the at least one absorption region 
wherein the intermediate layer is in the form of { HEAD ~ a continuous layer } comprising at least one recess , { TAIL ~ the at least one recess } forming the at least one absorption region
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH