An access Problem : how to show a access report in A3 size and landscape mode

I have created a Form in Access 2010,in which there is a PDF button. When I click on that button it shows a report in PDF format.

I have this code for that

Private Sub cmdPrintReportPDF_Click()

    If Form_Graphs.tab_graph.Value = 2 Then

    DoCmd.OpenReport "Graph_report2", acViewReport
    DoCmd.OutputTo acOutputReport, "Graph_report2", ".pdf", "C:\Graph_report2.pdf", True
    'DoCmd.Close acReport, "Graph_report2"

    Else

    DoCmd.OpenReport "Graph_report", acViewReport
   DoCmd.OutputTo acOutputReport, "Grap开发者_Go百科h_report", "pdf", "C:\Graph_report2.pdf", True
    'DoCmd.Close acReport, "Graph_report"

    End If
End 

Now when the PDF is open its content is split into two pages. I want to set the page size and page layout of this PDF through VBA code. I have set the size and layout of report in the print preview but it works for only my computer, it doesn't work on other computers.

So what I want is to set the size and layout of the report through VBA code.