TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polyhydric alcohol has a neopentyl skeleton. The polyhydric alcohol is dipentaerythritol. The center line mean roughness of the inorganic layer on the organic layer is at most 2 nm. The organic layer has a thickness of 50-5000 nm. The inorganic layer has a thickness of 2-300 nm. The plastic film has an easy-adhesive layer on its surface. The easy-adhesive layer has a two-layered structure, and the binder in the first layer adjacent to the plastic film is polyester and the binder in the second layer just on it, is an acrylic resin or urethane resin. Preferred Definitions:    L=4C linear alkylene.    EXAMPLE - A dispersion was prepared by dispersing Finetex ES-650 (RTM: polyester resin binder) in water, and a surfactant was applied onto the plastic film and dried to form a first easy-adhesive layer having a thickness of 200 nm. A dispersion was prepared by dispersing an acrylic resin binder (latex of methyl methacrylate (MMA)-styrene (St)-2-ethylhexyl acrylate (EHA)-2-hydroxy-methyl methacrylate (HEMA)-acrylic acid (AA), having a solid concentration of 28%) in water, and a surfactant was applied onto the first easy-adhesive layer and dried to form a second easy-adhesive layer having a thickness of 200 nm. Photopolymerizing monomer of formula (II) (20 g) and Irgacure 907 (RTM: photopolymerization initiator) (0.6 g) were dissolved in methyl ethyl ketone (190 g) to prepare a coating liquid. The coating liquid was applied onto the plastic film, and under nitrogen purging to an oxygen concentration of 0.1%, and irradiated with UV rays at an illuminance of 350 mW/cm2 and at a radiation dose of 500 MJ/cm2, using metal halide lamp to form an organic layer. Argon was introduced as a plasma gas, and high-purity oxygen gas was introduced into the chamber, and the film formation pressure was controlled at 0.3 Pa to form the gas barrier film (test). Similarly a comparative was prepared using a monomer as described in JP-A-2002-264274. Both test/comparative were evaluated for water vapor permeability. Results showed that test/comparative had water vapor permeability (at radius of curvature of 20 mm) of 0.005/0.5 g/m2.day.