Multilayer structure, method for producing the same, and protective sheet for electronic device and electronic device using the same

A method for producing a multilayer structure, the method comprising:

• a step (I) of forming a precursor layer of a layer (Y) by applying, onto at least one face of a base (X), a coating liquid (S) comprising an aluminum atom-containing metal oxide (A), an inorganic phosphorus compound (BI), and a solvent, followed by drying the coating liquid (S) by heating at a temperature of 120° C. or more to remove the solvent;
• and
• a step (II) of forming the layer (Y) by subjecting the precursor layer of the layer (Y) to a heat treatment,
• wherein
• in the step (I), a time period from the completion of the coating with the coating liquid (S) to the start of the drying by heating is 1.8 sec or more and 9.0 sec or less, and
• in a L*a*b* color system of the multilayer structure obtained, an a* value is −0.8 or more and 0.8 or less and a b* value is −0.8 or more and 0.8 or less, the a* value and the b* value being measured in accordance with JIS Z 8722:2009.