A position variance parameter describes fluctuations of particle position around lattice points. It gives rise to an attenuation factor of Debye-Waller type.
It can be set using the method setPositionVariance(variance)
of class Interference2DLattice.
The argument variance
is in nm$^2$.
By default the variance is zero.
A square lattice of hemispheres on a substrate, for different lattice orientation angles xi.
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