look on the Thai eVisa website. Multiple entry Non O based on marriage no longer available.
Thailand Visa Options: Thai e-Visa & Non-Immigrant Visa ...
To obtain long-term residence in Thailand as the spouse of a Thai national, you must first apply for a 90-day Non-Immigrant O visa from a Thai embassy or consulate outside Thailand, then extend this visa to a 1-year marriage visa at a local immigration office in Thailand. For multiple entries into Thailand during the 1-year period, you will need to apply for a separate Multiple Re-entry Permit at an immigration office in Thailand after your 1-year extension is granted.