The microscopic relief structure 4 is {HEAD ~ an optically effective grating} with {TAIL ~ parallel straight or curved grooves} and at least locally involves a periodic structure which is described by the parameters thereof 
The microscopic relief structure 4 is { HEAD ~ an optically effective grating } with { TAIL ~ parallel straight or curved grooves } and at least locally involves a periodic structure which is described by the parameters thereof
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH