Moreover, we further consider the initial condition 𝑤(𝑧, 0) = 0, since there is only cubic symmetry at the beginning of the experiment. The numerical value for 𝐷 𝑑𝑖𝑔 was obtained by analysing the growth rate 𝑘 of hexagonal phases within a thin film under polarized light. The obtained rate was 𝑘 =