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The magnetic field distribution can be measured by magnetic force microscopy and scanning SQUID microscopy, from which one can extract both the penetration depth $\\lambda_L$ and magnetic susceptibility $\\chi$. When the magnetic moments are parallel to the surface, one extracts $\\lambda_L/\\sqrt{1-4\\pi \\chi}$. When the moments are perpendicular to the surface, one obtains $\\lambda_L$. 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