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The Casimir and van der Waals forces acting between two metallic plates or asphere (lens) above a plate are calculated accounting for the finiteconductivity of the metals. The simple formalism of surface modes is brieflypresented which allows the possibility to obtain the generalization of Lifshitzresults for the case of two semi-spaces covered by the thin layers. Additionalclarifications of the regularization procedure provides the means to obtainreliable results not only for the force but also for the energy density. This,in turn, leads to the value of the force for the configuration of a sphere(lens) above a plate both of which are covered by additional layers. TheCasimir interaction between Al and Au test bodies is recalculated using theoptical tabulated data for the complex refractive index of these metals. Thecomputations turn out to be in agreement with the perturbation theory up to thefourth order in relative penetration depth of electromagnetic zero pointoscillations into the metal. The disagreements between the results recentlypresented in the literature are resolved. The Casimir force between Al bodiescovered by the thin Au layers is computed and the possibility to neglectspatial dispersion effects is discussed as a function the layer thickness. Thevan der Waals force is calculated including the transition region to theCasimir force. The pure non-retarded van der Waals force law between Al and Aubodies is shown to be restricted to a very narrow distance interval from 0.5 nmto (2--4) nm. New, more exact, values of the Hamaker constant for Al and Au aredetermined.Comment: 5 figure

Casimir and van der Waals forces between two plates or a sphere (lens) above a plate made of real metals