Certainly not the syntactically incorrect $[0,2] \times \left[0,4-\sqrt{3}\right] \times \left[0,4-\sqrt{3}\right] \mathop{\Large\times}_{i=1}^{k-3}[0,2]$. 

Why not $[0,2]\times[0,4-\sqrt3\,]\times[0,4-\sqrt3\,]\times[0,2]^{k-3}$?