Ba4Mn3O10 and Sr4Mn3O10 crystallize in an orthorhombic crystal structure consisting of corrugated layers containing Mn3O12 polydedra. The magnetic susceptibility of the compositions consists of a broad hump like feature around 200 K indicating the presence of low dimensional magnetic correlation. We have recently investigated the magnetic data of these compounds and found that the experimental results match quite well with the two dimensional Heisenberg model of spin-spin interaction. The 2D nature of the magnetic spin-spin interaction is supported by the low temperature heat capacity data of Ba4Mn3O10. Considering 2D magnetic character as well as the multiferroicity, it is pertinent to investigate the samples thoroughly via inelastic neutron scattering (INS). INS is important to know the crystalline electric field energy levels as well as to confirm the 2D spin wave excitations.