Citation: K\"oferstein, Roberto; Arnold, Michael; Robl, Christian (2018). Crystal Structure and Characterization of Two Layered Copper(II) Coordination Polymers with Anions of 3-Phosphonopropionic Acid and (RS )-2-Phosphonobutyric Acid'. Zeitschrift f\"ur anorganische und allgemeine Chemie, 644, pp. 205-.