Method: VK-X1000 has been used to measure the surface topography of the samples provided. VK-X1000 is a 3D laser scanning microscope, which is manufactured by a Japanese company named Keyence, that is designed for high-precision surface measurement and imaging at the micro- and nanometer scale. The resolution along the z-direction of this microscope is about 20 nm. Materials: It's the sample "A12" Authors: Md Habibur Rahman, Nabila Ali, Alison C Dunn