var prj = DlxApp.GetJob().GetProject("Example PCB");
if (!prj.IsValid())
  prj = DlxApp.GetJob().NewProject("Example PCB");
var doc = prj.GetDocument("Examples PCB", DlxApp.DOCTYPE_PCB);
if (!doc.IsValid())
{
  doc = prj.NewDocument("Examples Pcb", DlxApp.DOCTYPE_PCB);
  doc.SetPageFormat("A4", false);
  var page = doc.NewPage("PCB", 0, true);
  page.LoadLayerStack("2 layer pcb stackup.clxlys");
  page.DrawBoard(new DlxRect(10, 10, 290, 200));
  page.SelectView("Draw Copper From Top");
}
if (doc.IsValid() && doc.Activate())
{
  var page = doc.GetActivePage();
  if (page.IsValid())
  {
    var layer = page.GetLayerFromType(DlxApp.LAYERTYPE_TOPASSEMBLY);
    DlxApp.Printf("The layer Top Assembly %sexist", layer.IsValid() ? "" : "not ");
  }
}