Visit Eucast.org of bacterial breakpoints tables for the European data (MIC=8mg/l); no disk diffusion data; they are inferred from ampicillin. But there is also the CLSI for US data. This standard uses ampicillin as a class representative and susceptibility of this agent is MIC

The inhibitory concentration of amoxicillin and ampicillin can be considered equivalent in terms of antimicrobial activity. Thus you can use the ampicillin breakpoints and inhibition diameters of ampicillin.