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It is shown that a two-dimensional (2D) array of hard disks being confined laterally within a quasi-1D hard wall channel of the width commensurate the bulk 2D triangular lattice at disks close packing, possesses a bimodal probability distribution for the distance between the disk\u2019s left and right nearest neighbors. The observed feature aligns with the concept of locally favored structures intensively exploited in the studies of anomalous thermodynamic and kinetic behavior of hydrogen-bonding fluids, except that the reported case is driven by entropic bonding only. The bimodality is observed in a range of densities associated with the vicinity of freezing transition in bulk 2D hard disks, indicating a crossover from the \u201cgas-like\u201d to \u201cliquid-like\u201d state in confined quasi-1D hard disks. Such a phenomenon was not reported for bulk 2D hard disks and is physically unexpected for confined q1D hard disks.<\/jats:p>","DOI":"10.1063\/5.0249154","type":"journal-article","created":{"date-parts":[[2025,5,8]],"date-time":"2025-05-08T10:13:19Z","timestamp":1746699199000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Bimodality of local structural ordering in extremely confined hard disks"],"prefix":"10.1063","volume":"162","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2257-0779","authenticated-orcid":false,"given":"A.","family":"Trokhymchuk","sequence":"first","affiliation":[{"name":"Faculty of Chemistry and Chemical Technology, University of Ljubljana 1 , Ljubljana,","place":["Slovenia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2435-6397","authenticated-orcid":false,"given":"A.","family":"Huerta","sequence":"additional","affiliation":[{"name":"Facultad de Fisica, Universidad Veracruzana 2 , Xalapa,","place":["Mexico"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4360-0634","authenticated-orcid":false,"given":"T.","family":"Bryk","sequence":"additional","affiliation":[{"name":"Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 3 , Lviv,","place":["Ukraine"]},{"name":"Institute of Applied Mathematics and Fundamental Sciences, Lviv Polytechnic National University 4 , Lviv,","place":["Ukraine"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2025,5,8]]},"reference":[{"key":"2025050806131056900_c1","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1007\/3-540-45043-2","article-title":"Fun with hard spheres","volume-title":"Statistical Physics and Spatial Statistics","author":"Mecke","year":"2000"},{"key":"2025050806131056900_c2","volume-title":"Theory of Simple Liquids","year":"1986"},{"key":"2025050806131056900_c3","doi-asserted-by":"publisher","first-page":"448","DOI":"10.1016\/j.supflu.2010.10.041","volume":"55","year":"2010","journal-title":"J.\u00a0Supercrit. 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