[Wien] vacuum space in slab calculation

[Griselda Garcia]

Dear Drs. Blaha and Andersen,

Thank you!! for yours indications.

As Dr. Blaha suggested, I calculated the work function in the three 
cases and the values is the same for them, so I consider that a vacuum 
of 10 Ang is enough, Am I right?.

With respect to the number of layers, I did not meet problems with the 
convergence and it was easy (11 cycles). But I agree with you respect to 
the basis.

Thanks!! again.

Griselda