The angle of beveling or obliquely cutting one or more corner portions of the series resonators S1 and {HEAD ~ S2} may not necessarily be 45° and may alternatively be 30°, 60° or any other appropriate angle or, still alternatively, they may be arcuately beveled with a given radius of {TAIL ~ curvature} 
The angle of beveling or obliquely cutting one or more corner portions of the series resonators S1 and { HEAD ~ S2 } may not necessarily be 45 ° and may alternatively be 30 ° , 60 ° or any other appropriate angle or , still alternatively , they may be arcuately beveled with a given radius of { TAIL ~ curvature }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL