The spacers bond {TAIL ~ the substrate} to the transparent counter substrate and maintain {HEAD ~ a prescribed cell gap} 
The spacers bond { TAIL ~ the substrate } to the transparent counter substrate and maintain { HEAD ~ a prescribed cell gap }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD