Table 3. Thickness of PDMS films spun on glass substrates vs. PDMS substrates.

Percent PDMS	Mean thickness on glass (µm)	Mean thickness on PDMS (µm)	Increase in thickness from glass to PDMS (µm)	Percent increase in mean thickness from glass to PDMS
100%	12.8–13.1	14.3–14.6	1.3–1.6	11.3%
50%	7.8–8.0	8.7–9.2	0.9–1.3	14%
17%	1.48–1.74	1.68–1.92	0.07–0.30	11.6%

All spins were done for 5 min at 2000 RPM at the given concentration. The values are given as 95% confidence intervals for a sample of three slides.