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We demonstrate a strategy to introduce and tune Rashba spin-orbit interaction (SOI) to unprecedented magnitudes in inversion-symmetric solids by incorporating ultrasmall silver nanoparticles in bulk gold. The near-identical lattice constants of Ag and Au allow dense packing of the Ag\/Au hetero-interfaces without compromising the global BIS. By varying the density of embedded nanoparticles, we generate Rashba SOI in a bulk metal with coupling strength ~15 meV\u2219\u00c5, higher than any known system preserving BIS globally, and show up to ~20 times increase in the spin-orbit scattering rate. We argue that the combined effect of charge transfer at the interfaces and polaronic localization enhances the SOI.<\/jats:p>","DOI":"10.1126\/sciadv.adz1680","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T17:59:09Z","timestamp":1760119149000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":3,"title":["Emergent Rashba spin-orbit coupling in bulk gold with buried network of nanoscale interfaces"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-9588-2952","authenticated-orcid":true,"given":"Shreya","family":"Kumbhakar","sequence":"first","affiliation":[{"name":"Department of Physics, Indian Institute of Science, Bangalore 560012, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-8177-0649","authenticated-orcid":true,"given":"Banashree","family":"Debnath","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Science, Bangalore 560012, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tuhin Kumar","family":"Maji","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Science, Bangalore 560012, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Binita","family":"Tongbram","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Science, Bangalore 560012, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1551-6555","authenticated-orcid":true,"given":"Shinjan","family":"Mandal","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Science, Bangalore 560012, India."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-1191-108X","authenticated-orcid":true,"given":"T. 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