The abbreviation of the journal title "Foundations of physics" is "Found. Phys.". It is the recommended abbreviation to be used for abstracting, indexing and referencing purposes and meets all criteria of the ISO 4 standard for abbreviating names of scientific journals.
The table below outlines in detail the ISO 4 rules and matches to the ISSN maintained list of title word abbreviations (TWA) to derived the abbreviation.
matches the stem "foundation-"
Rule 4.3: prepositions shall be omitted from title abbreviations.