A plug can include a set of primary contacts for communication signal transmission, a storage device to store physical layer information, and a set of secondary contacts for PLI signal transmission. More specifically, the method synthesizing cerium oxide nanocrystals comprises; i) preparing a cerium-surfactant complex by reacting a cerium precursor and a surfactant in a organic solvent; and ii) aging said cerium-surfactant complex in an ether at a temperature of 100\xb0 C. The present invention also allows for the ease of data collection, annotation, storage, management, retrieval and analysis of scientific data through and into the database. Thereafter by feeding a hardenable mixture into the tool and hardening or hardening out the mixture, the sheets are surrounded with the mixture and connected to each other in a single working step to form the finished sheet stack.