  A simple model is proposed as a possible explanation for the checkerboard
pattern of modulations in the hole density observed in recent tunneling
experiments on underdoped cuprates. Two assumptions are made; first, an
enhanced hole density near the acceptor dopants and secondly short range
correlations in the positions of these dopants caused by their electrostatic
and anisotropic elastic interactions. Together these can lead to a structure
factor in qualitative agreement with experiment.
