MATLAB: 3D plot: XY axes plane at Z=0

3daxesaxisMATLABplot

When I create a 3D plot, e.g:
[x,y] = meshgrid([-2:.2:2]);
Z = x.*exp(-x.^2-y.^2);
surf(x,y,Z,gradient(Z));
The plane formed by the XY axes is drawn at Z=-0.5; can this be moved to Z=0, or at least the X,Y labels drawn at Z=0?
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