'Floating' graphene on a bed of calcium atoms

Adding calcium to graphene creates an extremely-promising superconductor, but where does the calcium go? In a new study, a Monash-led team has for the first time confirmed what actually happens to those calcium atoms. Surprising everyone, the calcium goes underneath both the upper graphene sheet and a lower 'buffer' sheet, 'floating' the graphene on a bed of calcium atoms.

source https://www.sciencedaily.com/releases/2020/09/200917105343.htm