According to Wikipedia,
The Supremacy Clause is the provision in Article Six, Clause 2 of the United States Constitution that establishes the United States Constitution, federal statutes, and treaties as "the supreme law of the land." It provides that these are the highest form of law in the United States legal system, and mandates that all state judges must follow federal law when a conflict arises between federal law and either a state constitution or state law of any state.
Does the Supremacy Clause apply for administrative law? Say the Federal Government enacts a Freedom of Information Act, and the States don't or they pass inferior legislation with fewer rights. Or say that the Federal Government enacts a law regulating the advertising activities in the public sector. Those are purely administrative matters. Does the Supremacy Clause dictate that the inferior or missing legislation by the states is supplanted by the federal law?