  We report magnetic neutron scattering measurements of incommensurate magnetic
order in a superconducting single crystal of La1.88Sr0.12CuO4. We find that the
incommensurate wavevectors which describe the static magnetism do not lie along
high-symmetry directions of the underlying CuO2 lattice. The positions of the
elastic magnetic peaks are consistent with those found in excess-oxygen doped
La2CuO4+y. This behavior differs from the precise magnetic order found in the
low temperature tetragonal La1.6-xNd0.4SrxCuO4 material for which stripes of
spin and charge have been observed. These observations have clear implications
for any stripe model proposed to describe the static magnetism in orthorhombic
La2CuO4-based superconductors.
