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Found this slide and I didn't understand the last statement.

All fiducials should have same image one layer down

Are fiducials not top/bottom layer registration targets during assembly ? Are/Can fiducials used during manufacturing to align layers prior to lamenting them ?

enter image description here

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Fiducials are registered using vision technology. Having the same image on the next layer into the board makes it clearer to a wider range of cameras.

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  • \$\begingroup\$ So in other words they want superimposed fiducials on the two outmost layers of each side of the PCB? \$\endgroup\$ – Rev1.0 May 13 '16 at 6:08
  • \$\begingroup\$ What you want is very clear fiducials. Superimposing them exactly facilitates this. \$\endgroup\$ – Ignacio Vazquez-Abrams May 13 '16 at 6:09

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