[Wannier] hopping in supercell, wich k-points grid?

[Carmine Autieri]

Dear Wannier90 users, I kindly ask a simple suggestion.

I am trying to calculate the hopping parameters in a supercell with a large z-axis using wannier90. 

The z-axis is 10 times longer than the other axes. Morover, the system is quasi two-dimensional.
I used 10 X 10 X 1 k-points grid. Is it enough for a good estimation of hopping parameters?
The calculation is very expensive for my machine. Do you think that a 8 X 8 X 2 grid should be really better? 

thanks
Carmine Autieri
Universita' di Salerno (Italy)