Communication: The melting temperature (Tm,) of thin poly[ethylene-co-(viny
l acetate)] films coated on a silicon wafer was investigated. Ellipsometry
was used to measure the Tm,which was found to decrease dramatically when th
e thickness of the film is less than 300 Angstrom. The relationship between
the lamellar thickness and the Tm, was thought to be responsible this thic
kness dependence of the Tm, in thin polymer films.