We do not observe significant differences in rs values for black silicon and Glaco surfaces (square and circular marks in Figure ) even when R < 0.1, i.e., small sub-millimetric water droplets on both surfaces exhibit similar contact angle values θ = 148±2 • (obtained from the y-intercept of the dashed-dot line). Measuing θ directly from the sideview images give similar values for black silicon and Glaco surfaces (See Supporting Figure ).