Exact Solution of the Problem of the Entropy of Two-Dimensional Ice

The entropy of two-dimensional ice has been found by the transfer-matrix method. $\mathrm{Entropy}=Mk\ln W$, with $M=\mathrm{No}.\mathrm{of}\mathrm{molecules}$ and $W={\left(\frac{4}{3}\right)}^{\frac{3}{2}}$.