Molybdenum/Sulfur (1 of 2) (image) Rice University Caption Two-dimensional molybdenum/sulfur is a hexagonal lattice when seen from above, but when viewed edge on, as it is here, its three-layer form is apparent. When two sheets of the material meet, three-dimensional dislocations appear at the grain boundaries. When the sheets meet at a 60-degree angle, those boundaries are metallic, and conductive. Credit Yakobson Group/Rice University Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.