Where x represents the lateral flake size, µ and σ represent the mean and standard deviation of ln(x) respectively. 𝛷 is the cumulative distribution function of the standard normal distribution, and erf is the complementary error function. EEG and EEA flakes, with detailed distribution shown in the Supplementary Information (Fig. ). As a consequence, the average aspect ratios, 𝑠 = 𝑙/𝑡, sit at 142.6 and 142.1 for EEG and EEA flakes respectively. It indicates that the lateral size and thickness of both flakes varied in a relatively wide range, and the functionalization procedure did not alter the size much.