The first step involves applying {HEAD ~ a coating} containing the photosensitizer and polysiloxane polymers to the support which is {TAIL ~ a solid substrate} 
The first step involves applying { HEAD ~ a coating } containing the photosensitizer and polysiloxane polymers to the support which is { TAIL ~ a solid substrate }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL