Figure 2 (IMAGE) Institute for Basic Science Caption Optical micrographs of mono-, bi-, tri-, and tetralayer graphene on the SiO2/Si substrate. The insets of show cross-sectional TEM images of the corresponding graphene films. Credit IBS Usage Restrictions Please indicate the credit. 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.