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LM26001B: How to use inner layer

Part Number: LM26001B
Other Parts Discussed in Thread: LM26001

I'm desiging a multi-layer board which include LM26001B.The board is 4 layer.
1:Sig/LM26001
2:GND
3:POWER
4:Sig/No components

In the powerlayer, may I route Vin or Vout under the switching comonents (such as diode,inductor or input capacitor) ?