|Biopolymers are produced by organisms. These are monomeric units that are linked together to give rise to large structures e.g. RNA, DNA and polynucleotide. Multilayer films are thin layers of different structures. These multilayer films find application in optics, optical coatings, optical filters and mirrors etc. Multilayer films are best used for spatial filtering in optical imaging. A major process distinction between biopolymers and different polymers is found in their structures. All polymers are product of repetitive units referred to as monomers. Biopolymers typically have a well-defined structure, this is often not a process characteristic (lignocellulose), the precise chemical composition and also the sequence during which these units are organized is named the first structure, within the case of proteins. Several biopolymers fold into characteristic compact shapes that verify their biological functions and rely in a very sophisticated method on their primary structures. Structural biology is that the study of the structural properties of the biopolymers. These biopolymers also play a crucial role in medicinal sciences, pharmaceutical sciences and textiles. In distinction most artificial polymers have a lot of easier and a lot of random (or stochastic) structures. Thin-film layers are common within the flora and fauna. Their effects turn out colours seen in soap bubbles and oil slicks, similarly because the structural coloration of some animals. In several cases, iridescent colours that were once thought to result from planate layers, like in opals, peacocks, and also the Blue Morpho butterfly, prove to result from a lot of complicated periodic photonic crystal structures. In producing, skinny film layers is achieved through the deposition of 1 or a lot of skinny layers of fabric onto a substrate (usually glass). This is often most frequently done employing a physical vapour deposition method, like evaporation or sputter deposition, or a activity like chemical vapour deposition.