  In line with the Coulomb-oscillator model of superconductivity, loop currents
of excited 3s electrons from O^2- ions, passing in the CuO2 plane through
nuclei of nearest-neighbor oxygen quartets, create the antiferromagnetic phase
of undoped copper oxides. Holes, introduced by alkaline-earth doping of
La2CuO4, destroy the loop currents, thereby weakening antiferromagnetism until
it disappears at doping x = 0.02. Further doping of La_2-xAe_xCuO4 gives rise
to incommensurate free-hole density waves whose wavelength is determined by the
spacing of a doping superlattice. Modulating the ordering of the ions' magnetic
moments, the charge-density wave, of incommensurability 2 delta, causes a
magnetic density wave of incommensurability delta. The formula derived for
delta(x) is in excellent agreement with data from X-ray diffraction and neutron
scattering.
