def METHOD_NAME(element_a, element_b, a=None, c_over_a=1.626, x1=0.1697, z1=0.5629):
    """
    Builds a hexagonal $A B_2$ C14 Laves phase cell.
    Default fractional coordinates are chosen to reproduce CaMg2 Laves phase from the Springer Materials Database
    https://materials.springer.com/isp/crystallographic/docs/sd_1822295
    .. attention:: Change in Stochiometry possible!
        If any of the fractional coordinates fall onto their high symmetry values the atoms may be placed on another
        Wyckoff position, with less sites and therefor the cell composition may change.
        For `x1` avoid 0, 1/3, 2/3, for `z1` avoid 1/4, 3/4.
    Args:
        element_a (str, ase.Atom): specificies A
        element_b (str, ase.Atom): specificies B
        a (float): length of a & b cell vectors
        c_over_a (float): c/a ratio
        x1 (float): fractional x coordinate of B atoms on Wyckoff 6h
        z1 (float): fractional z coordinate of A atoms on Wyckoff 4f
    """
    return ase_to_pyiron(
        METHOD_NAME(
            element_a=element_a,
            element_b=element_b,
            a=a,
            c_over_a=c_over_a,
            x1=x1,
            z1=z1,
        )
    )