2D Defects (IMAGE) Penn State Caption A laser beam (yellow) reflects off a 2D material (orange) highlighting a grain boundary defect in the atomic lattice. Credit MRI/Penn State Usage Restrictions Non commercial use only License Licensed content 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.