Micrograph 3 Layer (IMAGE) Penn State Caption False-colored scanning electron microscope image of a radio-frequency field-effect transistor composed of a 2-3 layer-thick epitaxially-grown tungsten diselenide active channel. Credit Brian Bersch, 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.