{HEAD ~ The quartz substrate} is cut from a crystal and has an orientation with {TAIL ~ reduced birefringence} 
{ HEAD ~ The quartz substrate } is cut from a crystal and has an orientation with { TAIL ~ reduced birefringence }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL