Here, the monolayer is assumed to be oriented such that its hydrophobic tails pointing the positive 𝑧 direction. If the tails are oriented upright as in the LC phase, then 𝑡 𝐶𝐸 = 𝑡 𝐶𝐸 𝑚𝑎𝑥 , equal to the maximum extended length of the C-E chain, which is the length of the 4 bonds connecting the five tails beads. That is 𝑡 𝐶𝐸 𝑚𝑎𝑥 = 4 × 0.516 𝑅 𝑐 = 1.34 𝑛𝑚. If the tails are oriented at an angle 𝜃 from the normal, the local hydrophobic thickness would be, 𝑡 𝐶𝐸 = 𝑡 𝐶𝐸 𝑚𝑎𝑥 cos 𝜃 (13) For 𝜃 = 45 𝑜 , 𝑡 𝐶𝐸 (𝜋/4)=0.94 nm. Since 𝑡 𝐶𝐸 is the center-to-center bead distance, the actual hydrophobic thickness will be larger by the radii of the first and the end beads. Thus, for a normal tail orientation, the monolayer hydrophobic thickness, 𝑡 ℎ = 𝑡 𝐶𝐸 𝑚𝑎𝑥 + 0.9824 𝑅 𝑐 = 1.97 𝑛𝑚. In Figure , 𝑡 𝐶𝐸 is plotted for the monolayers of different 𝑎 𝐿 . We distinguish LE and LC phases by a 𝑡 𝐶𝐸 value of 0.94 nm, based on the information from the 𝑆 plots and assuming a tail vector orientation of 45 0 at the LE-LC boundary. The plots clearly demonstrate the LC phase with a thickness over 0.94 nm, and the LE domains of lower thickness that grow to the complete LE phase at 𝑎 𝐿 > 104 𝐴 𝑜 2 per lipid.