Provided herein is a film and methods of producing the same. The film includes a substrate and a layer adjacent to the substrate, wherein a surface of the layer comprises spaced apart protrusions. The methods include providing a substrate, depositing a layer on at least a portion of the substrate, decomposing the layer to form at least a first phase of material and a second phase of material, and removing at least a portion of the second phase from the decomposed layer to form a structured layer.