Coated film structures with an aluminum oxide intermediate layer

A coated film structure comprising:

• a substrate layer comprising a polymer film substrate, the substrate layer having a thickness of from 1 μm to 120 μm;
• an overcoat layer comprising amorphous polyvinyl alcohol, the overcoat layer having a dry coat weight of from about 0.05 g/m2 to about 1.5 g/m2;
• and
• at least one intermediate layer disposed between the substrate layer and the overcoat layer, the intermediate layer comprising aluminum oxide and having a thickness from about 5 nm to about 30 nm;
• wherein the coated film structure comprises a rigid amorphous fraction (RAF) at an interface of the overcoat layer and the at least one intermediate layer, the overcoat layer comprising at least 30 weight percent RAF (% RAF) based on the total weight of the overcoat layer;
• wherein the coated film structure has an oxygen transmission rate of less than about 0.70 cm3/m2/day at 90% relative humidity and 23° C. as measured in accordance with ASTM D3985;
• and
• a water vapor transmission rate of less than 1.00 g/m2/day at 90% relative humidity and 37.8° C. as measured in accordance with ASTM E-398.