Magnetic interference pattern in planar SNS Josephson junctions

We study the Josephson current through a ballistic normal metal layer of thickness $D$ on which two superconducting electrodes are deposited within a distance $L$ of each other. In the presence of an ({\it in-layer}) magnetic field we find that the oscillations of the critical current $I_c(\mathrm{\Phi })$ with the magnetic flux $\mathrm{\Phi }$ are significantly different from an ordinary magnetic interference pattern. Depending on the ratio $L\mathrm{/}D$ and temperature, $I_c(\mathrm{\Phi })$-oscillations can have a period smaller than flux quantum ${\mathrm{\Phi }}_0$, nonzero minima and damping rate much smaller than $1\mathrm{/}\mathrm{\Phi }$. Similar anomalous magnetic interference pattern was recently observed experimentally.