Rolla-based Brewer Science, founded in 1981, developed and commercialized anti-reflective coating materials that were instrumental in the industry's progress in at least three different technologies - g-line to 248 nm to 193 nm lithography, and now to extreme ultraviolet and directed self-assembly technology. "Currently, multilayer systems are commonly used in optical lithography, with some processes using 5-6 layers, as well as double- or triple-patterning steps, to achieve the necessary resolution," reports Electronics Online.