@@ -0,0 +1,257 @@
+package etomica.potential;%0A%0Aimport etomica.api.IAtomList;%0Aimport etomica.api.IMoleculeList;%0Aimport etomica.space.Tensor;%0A%0Apublic interface IPotentialAtomicSecondDerivative extends%0A%09%09IPotentialTorque %7B%0A%09 public Tensor %5B%5D secondDerivative(IAtomList atoms);%0A%7D%0A

add IPotentialAtomicSecondDerivative