def METHOD_NAME(self, k):
    """
    A primary form of TD matrices (full).
    Args:
        k (tuple, int): momentum transfer: either a pair of k-point indexes specifying the momentum transfer
        vector or a single integer with the second index assuming the first index being zero;
    Returns:
        Output type: "full", and the corresponding matrix.
    """
    r1, r2, c1, c2 = krhf_slow.get_block_k_ix(self, k)
    (a, _), (_, b), (_, b_star), (a_star, _) = self.proxy_response_ov_batch((r1, r1, r2, r2), (c1, c2, c1, c2))
    return "full", numpy.block([[a, b], [-b_star.conj(), -a_star.conj()]])