Returns the 2nd simulated value of the n-th simulated spectrum in the spectrum list at the wavenumber specified by the 'wavenumber' property. This is used in cases like ellipsometry where there are two simulated quantitiesi: Psi and delta, or cos(psi) and tan(delta). In that case the 1st value (obtained by the function get_sim_val1) is the psi-related quantity. The second quantity is the one related to delta.

Writing this property has no effect.