Abstract
We derive an analytical expression for the solution of a two-dimensional quasicontinuum method with a planar interface. The expression is used to prove that the ghost force may lead to a finite size error for the gradient of the solution. We estimate the width of the interfacial layer induced by the ghost force is of $\co(\sqrt{\eps}\,)$ with $\eps$ the equilibrium bond length, which is much wider than that of the one-dimensional problem.
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