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