2. Glass Transition Temperature and Volume Thermal Expansion Coefficients Obtained from the Fit of the Density vs Temperature (Figure c) .

	bulk [Γ = 10–6ϵ/(k Bτ)]	thin film [Γ = 10–6ϵ/(k Bτ)]	thick film [Γ = 10–5ϵ/(k Bτ)]
T g [ϵ/k B]	0.421 ± 0.001	0.393 ± 0.002	0.4313 ± 0.0009
αmelt [k B/ϵ]	0.296 ± 0.001	0.286 ± 0.003	0.300 ± 0.002
αglass [kB /ϵ]	0.123 ± 0.002	0.098 ± 0.003	0.0971 ± 0.0007
αmelt/αglass	2.40 ± 0.03	2.92 ± 0.09	3.09 ± 0.03

^aThe precise value of the fitted parameters slightly depends on the procedure, however the small differences do not affect the conclusions. The results shown are for bulk melt, thin polymer film, and thick polymer film. In parentheses we report the cooling rates.