def METHOD_NAME():
    gs = make_grid_spec()
    _ = gs.grid_x.make_coords(
        axis=0,
        structures=[
            td.Structure(geometry=td.Box(size=(1, 1, 1)), medium=td.Medium()),
            td.Structure(geometry=td.Box(size=(2, 0.3, 1)), medium=td.Medium(permittivity=2)),
        ],
        symmetry=(1, 0, -1),
        periodic=(True, False, False),
        wavelength=1.0,
        num_pml_layers=(10, 4),
    )