Senevirathne, I.H. Beverstock, D.R. Delayen, J.R. Gurevich, A.V. Valente-Feliciano, A-M. JACoW Publishing Geneva, Switzerland 2673-5504 978-3-95450-234-9 10.18429/JACoW-SRF2023-MOPMB083 English 311-315 site cavity SRF niobium shielding Contribution to a conference proceedings 2023 2023-09 https://doi.org/10.18429/JACoW-SRF2023-MOPMB083 https://jacow.org/srf2023/papers/mopmb083.pdf We report measurements of the dc field onset B_{p} of magnetic flux penetration through NbTiN-AlN coating on bulk niobium using the Hall probe experimental setup. The measurements of Bp reveal the multilayer shielding effect on bulk niobium under high magnetic fields at cryogenic temperatures. We observed a significant enhancement in Bp for the NbTiN-AlN coated Nb samples as compared to bare Nb samples. The observed dependence of B_{p} on the coating thickness is consistent with theoretical predictions.