failed to converge for system with one lattice vector very long

[Xiaoming Wang]

Hello,

I found the SCF hard to converge for systems with one lattice vector very 
long. For example, my system is 15*15*100 (a*b*c) Ang, but still fully 
periodic. I could manage to get SCF easily converged by reducing the c. 
However, is there any strategy to get this extreme case work?

Best,
Xiaoming
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