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Here we present a spatially resolved characterization of SOFs formed in prebiotic discharge experiments, focusing on their chemical heterogeneity, structural organization, and role in the emergence of hollow organic biomorphs. Using a combination of electron microscopy and spectroscopic techniques, we show that the insoluble SOF is a continuous but chemically heterogeneous matrix whose molecular composition varies systematically across the reactor as a function of local gas\u2013liquid\u2013solid interactions. Distinct regions of the SOF are enriched in aliphatic amine-rich polymers, aromatic carbon domains, cyanide-derived intermediates, and amorphous carbon, indicating that hydrogen cyanide (HCN)-derived chemistry evolves differently within specific microenvironments rather than proceeding uniformly throughout the system. We further demonstrate that spherical, caterpillar-like, and polyp-like hollow biomorphs preferentially emerge at hydrated interfacial regions of the SOF, thereby directly linking their morphogenesis to spatial chemical heterogeneity and phase-boundary chemistry in spark-driven systems. The SOF\u2019s capacity to shield chemically fragile solutes and emerging biopolymers through near-ultraviolet chromophore absorption, combined with its abiotic compartmentalization properties, suggests a potentially important role in abiogenesis.<\/jats:p>","DOI":"10.1177\/15311074261493395","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T02:03:03Z","timestamp":1791424983000},"page":"1020-1034","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["A Detailed Characterization of Protocells and Solid Organic Films (SOFs) Forming in Miller-Urey-Type Spark-Discharge Experiments"],"prefix":"10.1177","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6136-8584","authenticated-orcid":false,"given":"Christian","family":"Jenewein","sequence":"first","affiliation":[{"name":"Donostia International Physics Center, Donostia, 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