SEM Image of Concavities (IMAGE) University of Cambridge Caption This SEM image of concavities is covered by a conformal multilayer stack of 11 alternating layers of titania and alumina. Credit Mathias Kolle, University of Cambridge Usage Restrictions None 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.